Pneumatic rivet-breaker.



S. J. SEDINGER.

PNEUMATIC RIVET BREAKER..

` APPLICATION FILED MAI/I5, I9Is.

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ruf-ff Patented OCI. 17,1916.

`on the line 3 3 of Fig. 1,

` plunger is to be returned toward thecylin-` nfrnn'r ormoni.

arena-warn a'. snnING-na, or INDIANAroms, INDIANA, AssIGNon or ONE-HALF'ro e enovnn nanna, or INDiANAroLIs, INDIANA.

rNEur/ m'rro River-Bananas.

specification of Letters Patent.

Patented Oct. 17, 1916.

Application led May 1,5, 1916. Serial No. 97,608.

To all 'whom it may concern:

Be it known that I, SToNnwALL J. SED- inenn, a citizen of the UnitedStates, residing at. indianapolis, Marion cunty, and State of Indiana,have invented and discovered' certain ynew and useful Improvements -in-Pneumatic lRivet-Pmeakers,l of

which the followingis a specification. 0

My invention relates to pne'umatic rivet breakers, and its object is toprovide a tool of this character adapted to obtain a maximum efficiencyof power from the com-- pressed Aair and to enable the cost ofconstruction of such a tool to be greatlylesscned, and to enable theweight of the same to be decreased as compared with previous devices ofthis character, and also to provide means whereby the parts may bereadily assembled.

With these objects in view,my invention is embodied in preferable formin the construction and arrangement hereinafter described andillustrated in the accompanying drawings.

ln these drawings, Figure 1 is a longitudinal sectional view of .theimproved tool; Fig. 2, an end View of and Figs. 3, 4; and 5, crosssectional views illustrating the controlling valve in three positions,viz:- that given when the plunger is to be driven toward the chisel;that given it when it is to be neutral; and that given it when theder-head.

Referring to the drawings, 1 designates the head of the tool, which headconsists of a hollow cylindricalrbody having a central hollow valvechamber therein, in which is adapted to be seated a cylindrical orconical rotatable air-controlling valve 2'. This valve is retained inplace within the chamber by means of ahead plate 3 which .is screwed tothe head by means of screws Ll. A screw bolt is attached to the valveand operates freely through the head plate and is provided atv its outerend with a projecting handle 6 whereby the valve is adaptedto bemanually operated to alternately effect the forward driving stroke ofthe plunger upon the cuttingchisel and the return movenient of theplunger, or to seat the valve in neutral position.

In order to limit the movement of the valve and determine the registryof the ports the head of the same;

thereof witheither the ports that establish vthe forward flow ofthe'power medium o r the return flow thereof, a stop pin 7 is'providedin the fixed head plate, lwhich. 'pin enters an arcuate slot 8 formedinthe outer face of the valve.

The valveis of such construction as to permit a comparatively unimpededflow of the' compressed air therethrough, thus decreasing frictionandavoiding a loss of power in operating the tool.' To this end,

the said valve Ahas an elongated circular port or passageway -9extending through the wall at right angles Vto the axis -of the valveand communicating at the center of the valve with a longitudinal,elongated port or passageway 10, constituting the central bore of jthevalve 'which is adapted to communicate at its lnner end with anaperture 11 leading through the inner cross 'wall of the valvechamberhead. The valve also has a cutaway segmental portion 12 constituting aflatted port 'which is adapted to' establish y y communicationciroumferentially of the valve between two of the ports of the head whenturned to certain positions.

The valve head is provided with a series of four ports formed byhorizontal passageways extending through the wall of the headat rightangles tothe axis of the'valve and having the centers of said portslying in the same plane. Referring specifically to these ports, A13-isthe inlet port which is adapted to have communication with a pipe 14communicating with a hose 15 which leads to a suitable source ofcompressed air. 16 is anexhaust port; 17 is also an exhaust portcommunicating with an exhaust pipe 18, and 19 is a port adapted tocommunicate with the upper end of a pipe section 20, whichcommunicatesby a hose -21- with the lower end of the tool .in order to:supply compressed air for thepurpose of returning the operating plungerto normal position after each stroke. hose terminates in a pipesection22'and this lower section is screw threaded into an opening formed inthe side wall' of a 'nose piece 23 which consists of a hollow shell andwhich is provided with a surface port '24 leading from said opening andadapted to admit the compressedair-to the lower end of the tool.

A hollow, longitudinaltube 25 fits be- The lower end of the tween thehead v1 and the shell 23 consti tut 1110 ying the nose piece, and thistube is adapted to receive the compressed air at either end thereof. Inthis'tube is mounted a reciprocal air-operated stitute the1 drivingmember -for |a cutting chisel 27, the shank 28 of which is freelymounted. withnathe body of. the Shell of thel nose piecey and.l whichchisel is adapted to be supported by operators while the other'operatormanipulates the valve so as to direct the air currentito effect-thedriving and returnl movements ofthe plunger. A clamping plate 29 bearsagainst the nose piece, and the head of the valveand the nose piece areheld together and the tube held clamped between said parts by means oflongitudinally extending bolts 30.

Itwill be seen that the admission port 24 leadingacross the inner'faceof the body of lthe nose piece 23 is below the level of said face andalso beyond the end ofthe plunger unnecessary inclosing tube 25 wherebyit'is form a port or opening through the tube itself, which-arrangementdispenses with the necessity of bringing two apertures into jregistrywhen' openings through both the nose piece and the tube are formed, ashas n y' heretofore been the practice, and the estabf element ofconsiderable difficulty in adjust-` lishment of. which registry isfrequently an ment.

The operation' of the tool is as follows:

Assuming that it is. desired to drive -the the chisel for a cuttingoperation, the valve plunger forward so as to force it against is turnedto the position indicated in Fig.

I .3, wherein the inlet port 13 leading vfrom the source of compressed'air will be in registry with the horizontal port 9 ,of the valve,whereby the power medium is directed downwardly through the opening 10in the valve head and against the upper end of the plunger 26, forcingthe latter down against the end of the chisel to perform the cuttingoperation. In this traverse of the air, it will be seen that it iscompelled to make only one angular turn, owing to the central passageand single admission port the ports in the nose through the valve. Inthe downward descent of the plunger, the air in the tube ahead of thesame will be forced out through piete into the connecting pipe 21 andthence through port 19 of the valve head and thence out through port.17to the exhaust pipe 18 by means of the flatted port 12 on the peripheryof the valve, which port will be brought into registry with said ports19 and 17 whenever Vthe valve ris turned to position to admit the airfor the forward stroke. To return the plunger to its upper or outerposition, ready for another cutting stroke, has charge of the controlthe valve to the position the operator who of the tool turns indicatedin vFig.

plunger26 adapted to conthe hand of onepof the.

.two vair inlet in the same v head at right one of said inlet portshaving communica- 5, .whereupon the air will be admitted through theport 18 and thence by means of theV Hatted port on Vthe valve throughthe port 19 to the connecting pipe 21 which conveys the air to the otherend of the tube and serves to drive the plunger toward the valve head.In this-movement the air bethe valve andV through the'main longitudinalpassage 10 of the valve and 'out through the horizontal ports 9 a'nd 16;

y In F position with blank spaces thereof covering the main inlet andoutlet ports.

.tween the inner end of the plunger and.A

head is exhausted. out through the opening -11 leading through theqvalve head ig. 4, the valve is shown in neutral" Having thus describedmy invention,

what I claim is:

1. A pneumatic rivet breaker having an air receiving tube, a nose pieceand a c lindrical head between whichsaid tube is eld, a cylindricalrotatable valve'in said head having a passageway, lthe axisl of whichextends longitudinally of the axis of the tube and communicates with aport in the end of the tube, said valve having also a port at rightangles to the axis of the tube and meeting the longitudinal passagewayof the valve and adapted tocommunicate with ports leading directlythrough the ead at right angles to the axis'thereof, and

an o erating handle for the valve lying -beyon the end of the head in aplane at right of the valve and head.

angles to the axis manually operated pneu- 2. A portable,

matic rivet breaker having an air receiving tube, a reciprocableplungerv therein, a cutting chisel operable by the plunger, airadmittingmeans at both ends of the tube, a cylindrical valve head at oneend of the tube and in longitudinal continuation thereof, and having twoexhaust ports and ports arranged substantially circle extending throughthe angles to the axis of the tube,

tion with a source of compressed air and the other having communicationwith the opposite end of said tube, and a-controlling valve having acentral longitudinal bore therein having continuous communicationthrough the valve head with said tube and having a port extending atright angles to said bore throughv the wall of the valve andcommunicating with said bore passageway,

plane at right angles toV I, Leonesa 3. A pneumatic rivet breaker havingair receiving tube, a reciprocable plunger therein, a cutting chiseloperable by theV through the wall thereof at right angles to the axis ofthe valve, which ports have their centers in substantially the sameplane, a pipe connecting one of said ports and the lower end of thetube,a source of compressed air supply, means of connection between saidsource and one of said ports in the valve head, two of suchportsconstituting exhaust. ports, said4 valves having a central longitudinalpassageway adapted to continuously register withA the central opening inthe valve head and' having a port leading through its wall at rightangles to its axis, and communicating with sald central passagewa adapteto register with two o and also having a peri heral port the valve headports and means for determining the position of the .valve to direct theair to either give theforward driving stroke to the gliinger or toreturn the same toward the cad l 4. A pneumatic rivet breaker having anair receiving tube, a cylindrical nose iece and a valve head havingsockets in w ich the opposite ends of said tube fit and are supported,means for clamping the head and nose piece together, said nose piecehaving a port beyond the adjacent end of the tube leading through thesocket walland an air conveying pipe connecting a port in said valve head and said port 1n the nose piece.,

Inwitness whereof, I yhave hereunto set my hand and seal atlndianapolis, Indiana, this 13th day of May, A. D. nineteen hundred andsixteen.

STONWLL J. SEDlNGER. [1.58.] Witnesses: v

H. P. Doom'rrm, GnovER HANNA.

